石墨烯/铜镍铁氧体复合材料的制备及性能研究

为制备出宽波段磁波衰减材料，采用水热法制备得到了石墨烯/铜镍铁氧体复合材料（CNFRGO），并对其进行SEM、XRD、红外光谱和拉曼光谱表征分析；然后测量其2~18 GHz的电磁参数，并计算其损耗角正切值和反射损耗，进而分析其微波衰减性能；最后，测量其中远红外波段的复折射率，利用测量数据和T矩阵法计算分析其红外波段消光和吸收性能。结果表明，尖晶石型铜镍铁氧体纳米颗粒吸附在还原石墨烯上，粒径大部分约为20 nm；CNFRGO同时具有介电损耗和磁损耗两种机制，其反射损耗低于-10 dB的频宽为3.7 GHz，在11.8 GHz处有峰值-14.7 dB；CNFRGO在近红外波段消光较强主要由散射引起，中远红外波段则主要由吸收决定，而其吸收能力在近红外和中红外波段较强，但在远红外大气窗口内相对较弱。因此，CNFRGO可同时吸收微波和红外辐射，是一种良好的微波与红外兼容材料。

Research on preparation and properties of graphene/copper nickel ferrite composites

In order to prepare electromagnetic wave attenuation materials in wide-band, the hydrothermal method was used to prepare graphene/copper nickel ferrite composite (CNFRGO), and the composite was characterized by SEM, XRD, IR and Raman spectrum. Secondly, the electromagnetic parameters of the composite were measured at 2-18 GHz. Moreover, the loss tangent and reflection loss were calculated to analyze its microwave attenuation performance. Finally, its complex refractive index in IR band was measured, and its extinction and absorption properties were calculated and analysed by using the measured data and the T matrix method. The results show that the spinel-type copper nickel ferrite nanoparticles are adsorbed on the surface of reduced graphene oxide, and the particle size is mostly around 20 nm. CNFRGO have both dielectric and magnetic loss, and the bandwidth of its reflection loss lower than -10 dB is 3.7 GHz, and its peak is -14.7 dB at 11.8 GHz. In near-IR band, the strong extinction of CNFRGO is mainly caused by scattering. It's mainly due to absorption in middle and far IR band, and its absorption ability in near and middle IR band is strong, but it's relatively weak in far IR atmospheric window. Therefore, microwave and IR radiation can be absorbed simultaneously by CNFRGO, and it's a good microwave and infrared compatible material.